Sintering and properties of low-firing non-ohmic SrTiO3 ceramics
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The sintering and properties of non-ohmic SrTiO3 ceramics in the presence of Nb5+ as a donor dopant and Li+ as an acceptor dopant and sintering agent have been studied. Different sintering parameters, such as sintering temperature, sintering time, cooling rate, and the ambient atmosphere at the cooling stage, were investigated. The changes induced by each parameter on the electrical properties have been discussed. The segregation of lithium at the grain boundaries is mainly fulfilled at the cooling stage. The correct slow cooling rate and oxygen atmosphere are both favourable to the segregation of lithium at the grain boundaries, and thus result in an improvement of non-linear I–V characteristics. The lithium content and different lithium salts (Li2CO3, LiNO3, LiF) were also investigated.
KeywordsPolymer Atmosphere Lithium Cool Rate Electrical Property
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